the top stories. the president's 20th wedding anniversary, he andmittromneyfaceoff in thefirstdebate. thisone in denver. overnight, a conservative website released this 2007 video, getting lots of attention. it shows obama being racially divisive. the romney campaign says it's not responsible for that video's release. >>> american airlines says improperly installed clamps caused the seats to come loose during three recent flights. the airline and its pilots union have agreed to resume contract negotiations. >>> looking at today's weather. cooling down out west. mountain snow in montana. morning fog in the northeast. showers and thunderstorms from the carolinas, south to florida. >>> and finally, it may sound like a hungry teenager's dream assignment. get paid for eating fast food every, single day. >> what do you mean teenagers? it was an experiment by doctors to find out what fast food diets can do to your health. here's abc's john donvan. >> reporter: hitting the fast food drive-in for science. >> can i get five soft tacos? can i get a number four? >> reporter: over and over and o

a preview. >> reporter: both candidates took a break from theirintensedebatepreptuesday. with mitt romney getting a bite to eat in denver. and president obama visiting the hoover dam for the first time. both have relied heavily on their running mates this week to lead their campaigns. >> how they can justify raising taxes on the middle-class has been varied the last four years. >> reporter: it didn't take long for paul ryan to pounce on that comment. >> vice president biden just today said that the middle-class, over the last four years has been, quote, buried. we agree. that means, we need to stop digging by electing mitt romney. >> reporter: the latest abc news/"washington post" poll shows the race for president is still very close, which means every word and gesture tonight could impact the election. brandi hitt, abc news, denver. >> thanks to brandi hitt. abc's coverage of tonight's debate begins at 9:00 eastern, 6:00 pacific. >>> now, we turn to the trouble at american airlines. and actually progress on two fronts this morning. there is new movement in the bitter labor dispute